Oh, I have one of those! mr prank has made a mistake. Only the 5.7 LT1 Impalas were available in North America. A prototype and the first two production V12 Impalas in the UK, one in Germany, and another in Sweden, another in Italy, and another in China - The V12 Impalas mr prank was talking about were only sold in China and Europe. The one that was sold in China, has 475 hp from Shanghai GM detuned the Chinese emission standards to meet. The rest had the same 627 hp as in the McLaren F1 road car. And the engine was held back in the usual sedan-front funds. The front was full trunk. BTW, the prototype was a '95, not a '96. I have the fourth. Engine was placed in an unusual way (factory). And the engine was displayed ridiculous, even while driving, but can if desired be detected automatically (usually while driving on the highway). Smart. Sorry, my bad English.